And a black gay woman. And that be a positive reinforcement blacks gays & woman's

Or 'women' even.

OP, its nice that people have different ideas, but a wheelchair bound Doctor just wouldn't last long. You're right that in story terms it would provide extra difficulties for The Doctor. However, it would also provide extra problems in the story telling, given the limitations. I'm all for fair representation, but no offense this seems like it would be a novelty idea for the sake of it.

How long before we get a race between The Doctor and Davros?

I'd be all up for introducing a companion with a disability, but The Doctor has always been able bodied, and I think he should stay that way.

The doctor would only be able to visit planets that are wheelchair accessible

Yes its a nice idea but i dont think it would do much for positive reinforcement if i am honest

I agree. He's The Doctor, so whenever he is faced with a problem wheelchair bound people face every day, he will have some super duper way out of it, or use the sonic screwdriver. Not to mention the fact that he could probably start regenerating to heal his legs, then filter the energy into a handy 'hand' or something.

Would make for an interesting storyline situation for a future episode. Prehaps on an alien planet where the gravity situation prevents any alien (Dr & companions) from being ably to walk and must use some form of a mobility device.

I'm disabled myself (arm disabled, not leg disabled) and I doubt a wheelchair bound actor could cope with the physical demands of the production over a long period of time. If they cast an able bodied actor to portray a disabled Doctor it would have the opposite effect so far as positive reinforcement goes and there'd be an outcry over the casting. A bit like a white actor 'blacking up' to portray a black Doctor.
I remember a few people claiming that Denzel Washington basically stole the Lincoln Rhymes role from Christopher Reeve because he could've played it more convincingly

Everything else aside wouldn't it be a bit illogical that a regeneration , which is actually a mechanism to regenerate the body back into a full healthy person would suddenly make the doctor not able to walk.

Everything else aside wouldn't it be a bit illogical that a regeneration , which is actually a mechanism to regenerate the body back into a full healthy person would suddenly make the doctor not able to walk.

Well it could go wrong, but I'm sure he'd fix that, not stay like it for an entire incarnation